Nada. Take it from someone who's been speaking Spanish for fifteen years; a "medical Spanish" course is rarely helpful if you don't already speak at a conversational level. Like I said, learning Spanish is something you have to commit to and is going to take more work than simply taking classes. The only time medical schools will have their interest piqued is if you're already a native speaker or if you've had extensive experience before applying. Pursue learning Spanish for your own enrichment and for your future practice, but you're fooling yourself if you think two years of college Spanish means anything to medical schools.
In terms of your ability to communicate with future patients, possibly (though unlikely if you don't continue speaking frequently outside of class after). In terms of med school, it might come up in an interview (I had one interviewer start talking to me in Spanish, since I put on my AMCAS that I spoke it) but it probably wouldn't impact you much beyond that.
